CRM is where every go-to-market system meets, and the catalog reflects it. The CRM & Sales industry on APIs.io now tracks 195 providers across 1,099 APIs. That is not a shortlist of the usual suspects. It is the whole revenue stack: the CRM cores everyone knows, the modern challengers rebuilding the category, the sales-engagement and prospecting layer, the revenue-intelligence tools reading your pipeline, and the service platforms that share the same contact graph.
The interesting story is the score spread. A handful of providers clear the exemplar band while most of the field sits in developing or thin. Depth of catalog is not the same as depth of API quality, and the numbers make that plain.
| Functional band | Providers | Composite scores |
|---|---|---|
| CRM cores | HubSpot, Salesforce, Pipedrive, Close | 78.6, 75.3, 57.1, 49.3 |
| Modern / open-source CRM | Copper, Twenty, Attio | 56.0, 54.2, 37.1 |
| Sales engagement & prospecting | Apollo, Salesloft | 42.9, 36.6 |
| Revenue intelligence & RevOps | Clari, Gong | 56.3, 36.8 |
| Service CRM | Zendesk | 69.7 |
HubSpot (78.6) and Salesforce (75.3) are the only two CRM providers in the exemplar band, and they earn it with the widest surfaces in the industry: 63 and 43 APIs respectively. Zendesk sits just behind at 69.7 with 145 APIs, the largest catalog of any provider here. After that top tier the scores fall off a cliff, which tells you where the integration risk lives.
What has shifted recently
First, the open-source CRM insurgency is real. Twenty (54.2) ships both REST and GraphQL against a Salesforce-alternative data model, and it is now scored as a legitimate entry rather than a curiosity. Copper (56.0) and Attio (37.1) round out a modern cohort betting on cleaner developer experience over feature sprawl.
Second, revenue intelligence has become its own band. Clari (56.3) and Gong (36.8) do not sell you a contact database. They read your existing CRM, calls, and email, then hand back forecasts and deal risk. These are consumption APIs layered on top of the cores, and they are multiplying.
Third, AI-native CRMs that “build themselves” are flooding in at the thin end. The catalog is full of one-API entrants pitching agent-native capture over manual data entry. Most score low today because the surface is small and the docs are young, but the volume signals where the category is heading.
Where to start
Browse the full industry at https://apis.io/industries/crm/. Filter by score band before you commit to anything. If you need a core, HubSpot, Salesforce, or Zendesk are the safe bets on API depth. If you are building integrations across the stack, note how many providers here also appear as unified-API platforms fronting the same handful of cores.
The takeaway: CRM has 195 doors on APIs.io, but only a few are wide open. Read the scores, not the logos.